And martin smith and andrew johnson



No. 6l7,724. Patented Ian. l7, I899.

M. P. ELGEN.

ROTARY ENGINE.

(Application filed Sept. 17, 1898.) (No Model.) 3Sheets-Sheetl. v

Witnesses. Inventor} Jfi'a nus itnesses:

No. s|7,724. Patented Ian. 17, was.

m. P. ELGEN.

ROTARY ENGINE.

' (Application filed Sept. 17, 1898.)

(No Model.) 3 Sheets-Sheet 3.

UNITED STATES PATENT fission.

MAGNUS P. ELGEN, OF ST. PAUL, MINNESOTA, ASSIGN OR OF PART TO JOHN J. MOE, CHARLES REI-INSTRAND, AND CHRIST BERG, OF VEST SUPERIOR, \VISOONSIN, AND MARTIN SMITII AND ANDREW JOHNSON.

ROTARY ENGINE.

SPECIFICATIONforming part of Letters Patent N 0. 617,724, dated January 17, 1899. Application filed September 17, 1898. s i 6 (N modem To all whom it may concern:

Be it known that I, MAGNUS P. ELGEN, of

St. Paul, Ramsey county, Minnesota, have invented certain Improvements in Rotary Engines, of which the following is a specification.

My invention relates to improvements in rotary engines,,and particularly in the construction of the valve and cutoff.

In the accompanying drawings, forming part of this specification, Figure l is a side elevation of my improved engine, partly broken away. Fig. 2 is avertical cross-seetion taken through the inner piston-cylinder x 5 andinlet-valve, and Fig. 3 is a vertical section taken longitudinally of the valve and" cylinder.

In the drawings, A represents the engine, provided with the central piston-chamber 2.

- 2o Said piston-chamber is connected with a ro-' tary valve B by means of the ducts 3 and 4, expansion-chambers 5 being formed in the wall of the piston-chamber adjacent said ducts.

0 represents the inner cylinder, which is formed with disks 6, fitting in the slots 7 in the opposite side of the engine-casing, said disks being provided'with suitable driving-shaft 8. As will be seen, the inner cylinder 0 is positioned inthe upper portion of the piston-- 0 chamber against the wall 9, which divides the ducts 3 and 4. Sliding pistons or abutments 10 are arranged in the slot 11 of the inner cylinder 0 and are separated and held in contact with the wall of the piston-chamber by the coil-spring 12.

13 is the steam-inlet pipe, which connects with the enlarged upper end of the passage 15, extending through the valve. As shown in Fig. 3, the lower end of the passage 15 4o communicates with the pipe 16, leading to the rotary cut-off valve D. This cut-01f valve consists of the ports 17 and 17,formed in the projecting face 18 ot the disks 7. As shown in Fig. 1, the pipe 16 connects the passage 4 5 15 with one side of the port 17, and the pipe'l9 connects the opposite side of the port 17 with one of the longitudinal passages 20, formed in the side of the valve B. These passages 20,

which are formed in each side of the valve,

connect with the ducts 3 and 4., leading to the piston-chamber. The passages are also connected by a transverse passage 21, which communicates with a valve-controlled port 22. The steam as it passes through the passage 3 to the piston-chamber will expand in the expansion-chambers 5, then acting upon the piston to operate the engine, then passing out through the passage 4 and through the port 23 to the exhaust-pipe 24. By referring to Fig. 1 it will be seen that the steam will be shut ofi as soon as the slot 17 is carried past the pipe 16, the same operation taking place when the slot 17 comes in communication with the pipes. There are thustwo inlets of steam to. each revolution of the cylinder. The valve Bis provided with a handle 25, by which it may be turned to bring the passage 15 into communication with the pipe 19 when the operation of the engine is reversed. The piston-chamber is provided with a suitable drainage-pipe 20.

The valve-controlled port 22 normally remains closed and is adaptedto be opened to allow an inlet of steam to start the engine when the pipes 16 and 19 stand .between the ports 17 and 17 and also when desired to serve as an additional inlet of steam.

I claim- 7 1. In a rotary engine, the combination with the cylinder having suitable inlet-ports, of the rotary valve arranged between said inletports and the source of steam-supply,the piston cylinder provided with sliding abutments, the rotary cut-0E valve D operated by said piston-cylinder, said rotary cut-0E valve communicating with the main rotary valve and to control the cut-off steam.

2. In a rotary engine, the combination with the cylinder, having suitable passages leading to the piston-chamber, of the inlet-valve the piston-cylinder having sliding abutments, the rotary cut-off valve D with the inlet steam-port and with ports leading to the piston-chamber.

3. In a rotary engine, the combination with 95 the cylinder provided with a piston-chamber and steam-passages leading thereto,the rotary valve arranged between said passages and the ton-cylinderarranged in said piston-chamber,

the rotaryc'nt-off valve D carried by said piston-cylinder and being provided with a pair of ports, the main rotary valve having 3. diametric passage normally connecting the inlet steam-pipe with a pipe leading to one of the ports of the cut- 0E valve and having passages connecting a second pipe leading to the port of the cnt-ofifvalve with the piston-chamber,

whereby the inlet of steam is out 01f by said cut-01f valve as the-piston-cylinder rotates.

In testimony whereof I affix my signature in the presence of two witnesses.

MAGNUS P. ELGEN.

\Vitnesses:

H. S. JOHNSON; ELGIE H. EVANS. 

